ZyXEL Communications ZyWall USG 50-H Series, User Manual

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Chapter 8 Interface
ZyWALL USG 50-H User’s Guide
212
8.15 Virtual Interface Screen
Use virtual interfaces to tell the ZyWALL where to route packets. Virtual interfaces can also
be used in VPN gateways (see
Chapter 19 on page 307 ).
Virtual interfaces can be created on top of Ethernet interfaces, VLAN interfaces, or bridge
interfaces. Virtual VLAN interfaces recognize and use the same VLAN ID. Otherwise, there is
no difference between each type of virtual interface. Network policies (for example, firewall
rules) that apply to the underlying interface automatically apply to the virtual interface as well.
Like other interfaces, virtual interfaces have an IP address, subnet mask, and gateway used to
make routing decisions. However, you have to manually specify the IP address and subnet
mask; virtual interfaces cannot be DHCP clients. Like other interfaces, you can restrict
bandwidth through virtual interfaces, but you cannot change the MTU. The virtual interface
uses the same MTU that the underlying interface uses. Unlike other interfaces, virtual
interfaces do not provide DHCP services, and they do not verify that the gateway is available.
This screen lets you configure IP address assignment and interface parameters for virtual
interfaces. To access this screen, click an
Add icon next to an Ethernet interface, VLAN
interface, or bridge interface in the respective interface summary screen. The fields vary by
interface.
Figure 163 Network > Interface > Bridge > Add
Each field is described in the table below.
Table 74 Network > Interface > Bridge > Add
LABEL DESCRIPTION
General Settings
Enable Interface Select this to enable this interface. Clear this to disable this interface.
Interface Properties
Interface Name This field is read-only. It displays the name of the virtual interface, which is
automatically derived from the underlying Ethernet interface, VLAN interface, or
bridge interface.
Description Enter a description of this interface. It is not used elsewhere. You can use
alphanumeric and
()+/:=?!*#@$_%-
characters, and it can be up to 60
characters long.